Lose and Loose are often used incorrectly.

Lose refers to loss. I can lose my keys, or lose a game of tennis, or lose my mind; or lose potential revenue. The word "loser" is also slang for a misfit, especially someone who has seldom been successful at a job, personal relationship, etc.

Loose, on the other hand, is the opposite of tight. For example, the screws were loose so the chair fell apart when Humpty Dumpty sat on it. The word "Loose" is sometimes also used to denote moral decadence (as in loose character).

Comparison chart

Loose versus Lose comparison chart
Edit this comparison chartLooseLose
Meaning Not tight Related to loss (to not win, or to misplace, or to not make a gain)
Part of speech adjective verb
Definitions 1. not firmly or tightly fixed in place; detached or able to be detached. (2) (of a garment) not fitting tightly or closely. 1. be deprived of or cease to have or retain something; 2. fail to win (e.g. a game); 3. become unable to find (something or someone).
Examples (1) Emma had a loose tooth. (2) A loose shirt is a fat man's best friend. (1) You may lose your right to vote if convicted of a felony. (2) Federer was gracious even after losing to Nadal. (3) I lose my keys all the time.

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